*{margin:0; padding:0; text-decoration: none;}
body{
    padding: 20px;
}
#container {
    width: 100%;
    height:468px;
    overflow: hidden;
    position: relative;
}
#list {
    width: 3000px;
    height: 468px;
    position: absolute;
    z-index: 1;
}
#list li {
    float: left;
    height: 100%;
}
#list li img {
    height: 100%;
}
#buttons {
    height: 10px;
    width: 135px;
    z-index: 2;
    margin: 0 auto;
    position: relative;
    top: 180px;
}
#buttons span {
    cursor:pointer;
    float:left;
    border: 1px solid #fff;
    width:6px;
    height: 6px;
    border-radius:50%;
    background: #333;
    margin-right: 5px;
}
#buttons .on {
    background:orangered;
}
.arrow {
    cursor: pointer;
    display: none;
    line-height: 39px;
    text-align: center;
    font-size: 36px;
    font-weight: bold;
    width: 40px;
    height: 40px;
    position: absolute;
    z-index: 2;
    top: 214px;
    background-color: rgba(0,0,0,.3);
    color: #fff;

}
.arrow:hover {
    background-color: rgba(0,0,0,.7);
}
#container:hover .arrow {
    display: block;
}
#prev{left: 20px;}
#next{right:20px;}

